StarRFoam Fan Fold is a lightweight, closed cell, rigid insulation manufactured from expanded polystyrene (EPS). StarRFoam Fan Fold can be used in Single Ply recover applications to save time and money. It is available with reflective metallic, clear, and white facers and is available in 200 sqft bundles. StarRFoam Fan Fold meets or exceeds ASTM C578, Standard Specification for Rigid, Cellular, Polystyrene Thermal Insulation.